Did you take these pics right before the lights come on? If not, they look sad. I would wrap something around those clear pots instead of covering them with a couple boxes. Minimize the amount of light to the root zone for better growth, hence the popularity of black pots. Moisture tends to cling to the plastic longer and the roots tend to grow out to moisture. Moisture + light = bad area for roots. They look ok, how long have they been under 12/12? For your next grow you might want to maximize your light and do a scrog. And flowering ends when the buds and trichomes have reached the size and maturity that it's environment has allowed......